How deep does a 7.62x39 penetrate Water?

At the muzzle, a representative 7.62x39 load penetrates approximately 1385 mm (54.5 inches) into water.

What is the impact energy of a 7.62x39?

This 7.62x39 load carries about 2045 joules (1508 ft-lb) at the muzzle.

Penetrates to ~55″ before stopping

Penetration depth

1385 mm (54.5″)

Impact velocity

715 m/s (2346 fps)

Muzzle energy

2045 J (1508 ft-lb)

Bullet behaviour

Intact

Fired at the muzzle, a representative 7.62x39 load (8 g, FMJ, 715 m/s) reaches roughly 1385 mm (54.5 inches) into water.

Water is a dense fluid medium; bullets destabilise and shed velocity quickly.